The Dong Fang DF250RTB has been discontinued by the manufacture! That is the information i have gathered from multiple sources! My buddy just bought a Dong Fang Ghost RTR but so far it is just plagued with problems! My Dong Fang RTB just passed 2k miles and running strong. Free flow exhaust, 110m-42p jetting, .002in-.003ex valves, 38t rear sprocket! 70mph is about it before your pushing the motor to hard! 29213810_10215900774577234_4955322993115922432_n.jpg29243853_10215900775017245_452056839891189760_n.jpg